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<?xml version="1.0" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>X509_check_private_key</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@hsxx.drive.ne.jp" /> </head> <body style="background-color: white"> <!-- INDEX BEGIN --> <div name="index"> <p><a name="__index__"></a></p> <ul> <li><a href="#name">NAME</a></li> <li><a href="#synopsis">SYNOPSIS</a></li> <li><a href="#description">DESCRIPTION</a></li> <li><a href="#return_values">RETURN VALUES</a></li> <li><a href="#bugs">BUGS</a></li> <li><a href="#see_also">SEE ALSO</a></li> <li><a href="#copyright">COPYRIGHT</a></li> </ul> <hr name="index" /> </div> <!-- INDEX END --> <p> </p> <hr /> <h1><a name="name">NAME</a></h1> <p>X509_check_private_key, X509_REQ_check_private_key - check the consistency of a private key with the public key in an X509 certificate or certificate request</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/x509.h></pre> <pre> int X509_check_private_key(X509 *x, EVP_PKEY *k);</pre> <pre> int X509_REQ_check_private_key(X509_REQ *x, EVP_PKEY *k);</pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p>X509_check_private_key() function checks the consistency of private key <strong>k</strong> with the public key in <strong>x</strong>.</p> <p>X509_REQ_check_private_key() is equivalent to X509_check_private_key() except that <strong>x</strong> represents a certificate request of structure <strong>X509_REQ</strong>.</p> <p> </p> <hr /> <h1><a name="return_values">RETURN VALUES</a></h1> <p>X509_check_private_key() and X509_REQ_check_private_key() return 1 if the keys match each other, and 0 if not.</p> <p>If the key is invalid or an error occurred, the reason code can be obtained using <em>ERR_get_error(3)</em>.</p> <p> </p> <hr /> <h1><a name="bugs">BUGS</a></h1> <p>The <strong>check_private_key</strong> functions don't check if <strong>k</strong> itself is indeed a private key or not. It merely compares the public materials (e.g. exponent and modulus of an RSA key) and/or key parameters (e.g. EC params of an EC key) of a key pair. So if you pass a public key to these functions in <strong>k</strong>, it will return success.</p> <p> </p> <hr /> <h1><a name="see_also">SEE ALSO</a></h1> <p><em>ERR_get_error(3)</em></p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></h1> <p>Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.</p> <p>Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p> </body> </html>